/*
 * Copyright 2015-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.rsocket.util;

import java.util.function.Consumer;

public abstract class OnceConsumer<T> implements Consumer<T> {
  private boolean isFirst = true;

  @Override
  public final void accept(T t) {
    if (isFirst) {
      isFirst = false;
      acceptOnce(t);
    }
  }

  public abstract void acceptOnce(T t);
}
